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 Post subject: Re: Noob crankset advice
PostPosted: Mon Apr 08, 2013 9:18 pm 
Gold Trader / MacRetro rider
Gold Trader / MacRetro rider
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Joined: Sun May 25, 2008 11:03 am
Posts: 18891
Location: Sunny Glasgow
Chainsets and bottom brackets are usually matched. So if you have an AC set of cranks then you need 109mm axle length(manufacturers recommendation) If its an XT then it would need a 112.5mm axle. If its a middleburn crank it will need the length of axle recommended for it and so on and so forth :?
Find out what axle length is required by shimano for their alivio crank and fit it. Unfortunately your thinking is that any crank fits any BB and this isnt so. Of course you could be lucky and find out the required axle length is the same but in the bike world we just aint that lucky :lol:

We could really really make this confusing for you by introducing into this formula something called the 'chainline' and we could go on further to explain in great detail and at great length the ins and outs of correctly measuring the bike its stays its cranks its BB and about 1/2 dozen other bits and nobody here knows what the f** it all means :shock: :shock: :lol:

Best stick with the makers recommended length :wink:
(tin hat at the ready Sir)

The thread stuff is just down to the headset you have fitted
Nowadays there are thousands of Ahead stuff about so swopping over is a doddle.
Call it £20 for a reasonable headset then you have the cost of a stem and thats about it.

Only thing to note is that as the threaded doesnt much stick up above the top of the tube the Ahead does. Youll need about 38mm for the headset plus any spacers you want under the stem to raise the height then the height of the steerer itself
For instance, if the headtube is 115mm youll need that +38mm[h/s]+50mm[stem] so you would require a fork with a steerer 203mm long as a minimum .Got that :D

 Post subject: Re: Noob crankset advice
PostPosted: Mon Apr 08, 2013 9:42 pm 
Dirt Disciple

Joined: Sat Mar 23, 2013 10:31 pm
Posts: 13
ok, Alivio Recommended bottom bracket spindle length - 113mm

No I stand corrected, there seems to be 4 different variations of that particular Alivio part with lengths 113, 118, 123, 126mm.

Cheers :D

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